To date, our database contains information on only one these Kingdoms:
Animalia

At least one and a half million species of animals have been classified
and there are estimates that there may be as many as 30 million species. Of
course, most of these are invertebrates - insects, mites, ticks, centipedes,
crustaceans, molluscs etc. For biologists to order this mass of information,
a scientific system called taxonomy was introduced.

The basic idea is to group species with similar characteristics together.
Within each group, the species that share more characteristics in common are
further grouped together, and so on and so on. To this end, the
taxonomic categories were devised, and they create the
taxonomic hierarchy. The hierarchy goes as follows: (with an example of a lizard):

Kingdom

Animalia

Phylum

Chordata

Class

Reptilia

SubClass

Lepidosauria

Order

Squamata

Family

Agamidae

Genus

Ctenophorus

Species

pictus

Common Name

Painted Dragon

Many organisms have common names, but these are often confusing as the same
organism can be known in different parts of the world by many
various different common names. Likewise the same common name can be
applied to different species, depending on the geographical
area.

There is an alternative system for categorising organisms -
cladistics. This system uses the idea of ancestry as it's
basis for dividing organisms into clades.